Network Working Group D. Walton
Internet-Draft D. Dutt
Intended status: Standards Track Cumulus Networks
Expires: January 7, 2016 July 6, 2015

Hostname Capability for BGP


In this document, we introduce a new BGP capability that allows the advertisemnet of a BGP speaker's hostname.

Status of This Memo

This Internet-Draft is submitted in full conformance with the provisions of BCP 78 and BCP 79.

Internet-Drafts are working documents of the Internet Engineering Task Force (IETF). Note that other groups may also distribute working documents as Internet-Drafts. The list of current Internet-Drafts is at

Internet-Drafts are draft documents valid for a maximum of six months and may be updated, replaced, or obsoleted by other documents at any time. It is inappropriate to use Internet-Drafts as reference material or to cite them other than as "work in progress."

This Internet-Draft will expire on January 7, 2016.

Copyright Notice

Copyright (c) 2015 IETF Trust and the persons identified as the document authors. All rights reserved.

This document is subject to BCP 78 and the IETF Trust's Legal Provisions Relating to IETF Documents ( in effect on the date of publication of this document. Please review these documents carefully, as they describe your rights and restrictions with respect to this document. Code Components extracted from this document must include Simplified BSD License text as described in Section 4.e of the Trust Legal Provisions and are provided without warranty as described in the Simplified BSD License.

1. Introduction

BGP is increasingly used inside the data center. Due to the sheer scale of devices involved, simplifying troubleshooting BGP would be very useful. One simple way to ease the troubleshooting is to display the hostname of the speaker in addition to the speaker's IP address. This document defines a new BGP capability that allows the exchange of a speaker's FQDN.

2. Specification of Requirements

The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this document are to be interpreted as described in [RFC2119].

3. FQDN Capability

The FQDN Capability is a new BGP capability [RFC5492]. The Capability Code for this capability is specified in the IANA Considerations section of this document. The Capability Length field of this capability is variable. The Capability Value field consists of the following:

             |  Hostname Length (1 octet)     |
             |  Hostname (variable)           |
             |  Domain Name Length (1 octet)  |
             |  Domain Name (variable)        |

4. Operation

The FQDN Capability SHOULD only be used for displaying the hostname and/or domain name of a speaker in order to make troubleshooting easier. The hostname and domain name used are assumed to be extracted from the hostname and domain name set on the device. While there are other ways to potentially obtain the same information, having standard BGP show commands use the hostname makes the use of this option quite powerful.

5. IANA Considerations

IANA has assigned capability number TBD for the FQDN Capability described in this document. This registration is in the BGP Capability Codes registry.

6. Security Considerations

This document introduces no new security concerns to BGP or other specifications referenced in this document.

7. References

7.1. Normative References

[RFC5492] Scudder, J. and R. Chandra, "Capabilities Advertisement with BGP-4", RFC 5492, February 2009.
[RFC2119] Bradner, S., "Key words for use in RFCs to Indicate Requirement Levels", BCP 14, RFC 2119, March 1997.

7.2. Implementation References

[quagga] Dutt, D., "Quagga - BGP FQDN Capability", May 2015.

Authors' Addresses

Daniel Walton Cumulus Networks 3701 NW Cary Parkway, Suite #300 Cary, NC 27513 US EMail:
Dinesh Dutt Cumulus Networks 185 E. Dana Street Mountain View, CA 94041 US EMail:

Table of Contents